// Copyright (c) 2021, gottingen group.
// All rights reserved.
// Created by liyinbin lijippy@163.com

#ifndef ABEL_CHRONO_INTERNAL_CHRONO_TIME_DETAIL_H_
#define ABEL_CHRONO_INTERNAL_CHRONO_TIME_DETAIL_H_

#include <cstdint>
#include <limits>
#include <ostream>
#include <type_traits>
#include "abel/base/profile.h"

namespace abel {
namespace chrono_internal {



// Support yearsthat at least span the range of 64-bit time_t values.
using year_t = std::int_fast64_t;

// Type alias that indicates an argument is not normalized (e.g., the
// constructor parameters and operands/results of addition/subtraction).
using diff_t = std::int_fast64_t;

namespace detail {

// Type aliases that indicate normalized argument values.
using month_t = std::int_fast8_t;   // [1:12]
using day_t = std::int_fast8_t;     // [1:31]
using hour_t = std::int_fast8_t;    // [0:23]
using minute_t = std::int_fast8_t;  // [0:59]
using second_t = std::int_fast8_t;  // [0:59]

// Normalized civil-time fields: Y-M-D HH:MM:SS.
struct fields {
    ABEL_CONSTEXPR_MEMBER fields(year_t year, month_t month, day_t day, hour_t hour,
                                 minute_t minute, second_t second)
            : y(year), m(month), d(day), hh(hour), mm(minute), ss(second) {}

    std::int_least64_t y;
    std::int_least8_t m;
    std::int_least8_t d;
    std::int_least8_t hh;
    std::int_least8_t mm;
    std::int_least8_t ss;
};

struct second_tag {
};
struct minute_tag : second_tag {
};
struct hour_tag : minute_tag {
};
struct day_tag : hour_tag {
};
struct month_tag : day_tag {
};
struct year_tag : month_tag {
};


// Field normalization (without avoidable overflow).

namespace impl {

ABEL_CONSTEXPR_FUNCTION bool is_leap_year(year_t y) noexcept {
    return y % 4 == 0 && (y % 100 != 0 || y % 400 == 0);
}

ABEL_CONSTEXPR_FUNCTION int year_index(year_t y, month_t m) noexcept {
    return (static_cast<int>((y + (m > 2)) % 400) + 400) % 400;
}

ABEL_CONSTEXPR_FUNCTION int days_per_century(year_t y, month_t m) noexcept {
    const int yi = year_index(y, m);
    return 36524 + (yi == 0 || yi > 300);
}

ABEL_CONSTEXPR_FUNCTION int days_per_4years(year_t y, month_t m) noexcept {
    const int yi = year_index(y, m);
    return 1460 + (yi == 0 || yi > 300 || (yi - 1) % 100 < 96);
}

ABEL_CONSTEXPR_FUNCTION int days_per_year(year_t y, month_t m) noexcept {
    return is_leap_year(y + (m > 2)) ? 366 : 365;
}

ABEL_CONSTEXPR_FUNCTION int days_per_month(year_t y, month_t m) noexcept {
    ABEL_CONSTEXPR_VARIABLE int k_days_per_month[1 + 12] = {
            -1, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31  // non leap year
    };
    return k_days_per_month[m] + (m == 2 && is_leap_year(y));
}

ABEL_CONSTEXPR_FUNCTION fields n_day(year_t y, month_t m, diff_t d, diff_t cd, hour_t hh,
                                     minute_t mm, second_t ss) noexcept {
    y += (cd / 146097) * 400;
    cd %= 146097;
    if (cd < 0) {
        y -= 400;
        cd += 146097;
    }
    y += (d / 146097) * 400;
    d = d % 146097 + cd;
    if (d > 0) {
        if (d > 146097) {
            y += 400;
            d -= 146097;
        }
    } else {
        if (d > -365) {
            // We often hit the previous year when stepping a civil time backwards,
            // so special case it to avoid counting up by 100/4/1-year chunks.
            y -= 1;
            d += days_per_year(y, m);
        } else {
            y -= 400;
            d += 146097;
        }
    }
    if (d > 365) {
        for (int n = days_per_century(y, m); d > n; n = days_per_century(y, m)) {
            d -= n;
            y += 100;
        }
        for (int n = days_per_4years(y, m); d > n; n = days_per_4years(y, m)) {
            d -= n;
            y += 4;
        }
        for (int n = days_per_year(y, m); d > n; n = days_per_year(y, m)) {
            d -= n;
            ++y;
        }
    }
    if (d > 28) {
        for (int n = days_per_month(y, m); d > n; n = days_per_month(y, m)) {
            d -= n;
            if (++m > 12) {
                ++y;
                m = 1;
            }
        }
    }
    return fields(y, m, static_cast<day_t>(d), hh, mm, ss);
}

ABEL_CONSTEXPR_FUNCTION fields n_mon(year_t y, diff_t m, diff_t d, diff_t cd, hour_t hh,
                                     minute_t mm, second_t ss) noexcept {
    if (m != 12) {
        y += m / 12;
        m %= 12;
        if (m <= 0) {
            y -= 1;
            m += 12;
        }
    }
    return n_day(y, static_cast<month_t>(m), d, cd, hh, mm, ss);
}

ABEL_CONSTEXPR_FUNCTION fields n_hour(year_t y, diff_t m, diff_t d, diff_t cd, diff_t hh,
                                      minute_t mm, second_t ss) noexcept {
    cd += hh / 24;
    hh %= 24;
    if (hh < 0) {
        cd -= 1;
        hh += 24;
    }
    return n_mon(y, m, d, cd, static_cast<hour_t>(hh), mm, ss);
}

ABEL_CONSTEXPR_FUNCTION fields n_min(year_t y, diff_t m, diff_t d, diff_t hh, diff_t ch,
                                     diff_t mm, second_t ss) noexcept {
    ch += mm / 60;
    mm %= 60;
    if (mm < 0) {
        ch -= 1;
        mm += 60;
    }
    return n_hour(y, m, d, hh / 24 + ch / 24, hh % 24 + ch % 24,
                  static_cast<minute_t>(mm), ss);
}

ABEL_CONSTEXPR_FUNCTION fields n_sec(year_t y, diff_t m, diff_t d, diff_t hh, diff_t mm,
                                     diff_t ss) noexcept {
    // Optimization for when (non-constexpr) fields are already normalized.
    if (0 <= ss && ss < 60) {
        const second_t nss = static_cast<second_t>(ss);
        if (0 <= mm && mm < 60) {
            const minute_t nmm = static_cast<minute_t>(mm);
            if (0 <= hh && hh < 24) {
                const hour_t nhh = static_cast<hour_t>(hh);
                if (1 <= d && d <= 28 && 1 <= m && m <= 12) {
                    const day_t nd = static_cast<day_t>(d);
                    const month_t nm = static_cast<month_t>(m);
                    return fields(y, nm, nd, nhh, nmm, nss);
                }
                return n_mon(y, m, d, 0, nhh, nmm, nss);
            }
            return n_hour(y, m, d, hh / 24, hh % 24, nmm, nss);
        }
        return n_min(y, m, d, hh, mm / 60, mm % 60, nss);
    }
    diff_t cm = ss / 60;
    ss %= 60;
    if (ss < 0) {
        cm -= 1;
        ss += 60;
    }
    return n_min(y, m, d, hh, mm / 60 + cm / 60, mm % 60 + cm % 60,
                 static_cast<second_t>(ss));
}

}  // namespace impl

// Increments the indicated (normalized) field by "n".
ABEL_CONSTEXPR_FUNCTION fields step(second_tag, fields f, diff_t n) noexcept {
    return impl::n_sec(f.y, f.m, f.d, f.hh, f.mm + n / 60, f.ss + n % 60);
}

ABEL_CONSTEXPR_FUNCTION fields step(minute_tag, fields f, diff_t n) noexcept {
    return impl::n_min(f.y, f.m, f.d, f.hh + n / 60, 0, f.mm + n % 60, f.ss);
}

ABEL_CONSTEXPR_FUNCTION fields step(hour_tag, fields f, diff_t n) noexcept {
    return impl::n_hour(f.y, f.m, f.d + n / 24, 0, f.hh + n % 24, f.mm, f.ss);
}

ABEL_CONSTEXPR_FUNCTION fields step(day_tag, fields f, diff_t n) noexcept {
    return impl::n_day(f.y, f.m, f.d, n, f.hh, f.mm, f.ss);
}

ABEL_CONSTEXPR_FUNCTION fields step(month_tag, fields f, diff_t n) noexcept {
    return impl::n_mon(f.y + n / 12, f.m + n % 12, f.d, 0, f.hh, f.mm, f.ss);
}

ABEL_CONSTEXPR_FUNCTION fields step(year_tag, fields f, diff_t n) noexcept {
    return fields(f.y + n, f.m, f.d, f.hh, f.mm, f.ss);
}

namespace impl {

// Returns (v * f + a) but avoiding intermediate overflow when possible.
ABEL_CONSTEXPR_FUNCTION diff_t scale_add(diff_t v, diff_t f, diff_t a) noexcept {
    return (v < 0) ? ((v + 1) * f + a) - f : ((v - 1) * f + a) + f;
}

// Map a (normalized) Y/M/D to the number of days before/after 1970-01-01.
// Probably overflows for years outside [-292277022656:292277026595].
ABEL_CONSTEXPR_FUNCTION diff_t ymd_ord(year_t y, month_t m, day_t d) noexcept {
    const diff_t eyear = (m <= 2) ? y - 1 : y;
    const diff_t era = (eyear >= 0 ? eyear : eyear - 399) / 400;
    const diff_t yoe = eyear - era * 400;
    const diff_t doy = (153 * (m + (m > 2 ? -3 : 9)) + 2) / 5 + d - 1;
    const diff_t doe = yoe * 365 + yoe / 4 - yoe / 100 + doy;
    return era * 146097 + doe - 719468;
}

// Returns the difference in days between two normalized Y-M-D tuples.
// ymd_ord() will encounter integer overflow given extreme year values,
// yet the difference between two such extreme values may actually be
// small, so we take a little care to avoid overflow when possible by
// exploiting the 146097-day cycle.
ABEL_CONSTEXPR_FUNCTION diff_t day_difference(year_t y1, month_t m1, day_t d1, year_t y2,
                                              month_t m2, day_t d2) noexcept {
    const diff_t a_c4_off = y1 % 400;
    const diff_t b_c4_off = y2 % 400;
    diff_t c4_diff = (y1 - a_c4_off) - (y2 - b_c4_off);
    diff_t delta = ymd_ord(a_c4_off, m1, d1) - ymd_ord(b_c4_off, m2, d2);
    if (c4_diff > 0 && delta < 0) {
        delta += 2 * 146097;
        c4_diff -= 2 * 400;
    } else if (c4_diff < 0 && delta > 0) {
        delta -= 2 * 146097;
        c4_diff += 2 * 400;
    }
    return (c4_diff / 400 * 146097) + delta;
}

}  // namespace impl

// Returns the difference between fields structs using the indicated unit.
ABEL_CONSTEXPR_FUNCTION diff_t difference(year_tag, fields f1, fields f2) noexcept {
    return f1.y - f2.y;
}

ABEL_CONSTEXPR_FUNCTION diff_t difference(month_tag, fields f1, fields f2) noexcept {
    return impl::scale_add(difference(year_tag{}, f1, f2), 12, (f1.m - f2.m));
}

ABEL_CONSTEXPR_FUNCTION diff_t difference(day_tag, fields f1, fields f2) noexcept {
    return impl::day_difference(f1.y, f1.m, f1.d, f2.y, f2.m, f2.d);
}

ABEL_CONSTEXPR_FUNCTION diff_t difference(hour_tag, fields f1, fields f2) noexcept {
    return impl::scale_add(difference(day_tag{}, f1, f2), 24, (f1.hh - f2.hh));
}

ABEL_CONSTEXPR_FUNCTION diff_t difference(minute_tag, fields f1, fields f2) noexcept {
    return impl::scale_add(difference(hour_tag{}, f1, f2), 60, (f1.mm - f2.mm));
}

ABEL_CONSTEXPR_FUNCTION diff_t difference(second_tag, fields f1, fields f2) noexcept {
    return impl::scale_add(difference(minute_tag{}, f1, f2), 60, f1.ss - f2.ss);
}


// Aligns the (normalized) fields struct to the indicated field.
ABEL_CONSTEXPR_FUNCTION fields align(second_tag, fields f) noexcept { return f; }

ABEL_CONSTEXPR_FUNCTION fields align(minute_tag, fields f) noexcept {
    return fields{f.y, f.m, f.d, f.hh, f.mm, 0};
}

ABEL_CONSTEXPR_FUNCTION fields align(hour_tag, fields f) noexcept {
    return fields{f.y, f.m, f.d, f.hh, 0, 0};
}

ABEL_CONSTEXPR_FUNCTION fields align(day_tag, fields f) noexcept {
    return fields{f.y, f.m, f.d, 0, 0, 0};
}

ABEL_CONSTEXPR_FUNCTION fields align(month_tag, fields f) noexcept {
    return fields{f.y, f.m, 1, 0, 0, 0};
}

ABEL_CONSTEXPR_FUNCTION fields align(year_tag, fields f) noexcept {
    return fields{f.y, 1, 1, 0, 0, 0};
}

namespace impl {

template<typename H>
H AbelHashValueImpl(second_tag, H h, fields f) {
    return H::combine(std::move(h), f.y, f.m, f.d, f.hh, f.mm, f.ss);
}

template<typename H>
H AbelHashValueImpl(minute_tag, H h, fields f) {
    return H::combine(std::move(h), f.y, f.m, f.d, f.hh, f.mm);
}

template<typename H>
H AbelHashValueImpl(hour_tag, H h, fields f) {
    return H::combine(std::move(h), f.y, f.m, f.d, f.hh);
}

template<typename H>
H AbelHashValueImpl(day_tag, H h, fields f) {
    return H::combine(std::move(h), f.y, f.m, f.d);
}

template<typename H>
H AbelHashValueImpl(month_tag, H h, fields f) {
    return H::combine(std::move(h), f.y, f.m);
}

template<typename H>
H AbelHashValueImpl(year_tag, H h, fields f) {
    return H::combine(std::move(h), f.y);
}

}  // namespace impl

template<typename T>
class civil_time {
public:
    explicit ABEL_CONSTEXPR_MEMBER civil_time(year_t y, diff_t m = 1, diff_t d = 1,
                                              diff_t hh = 0, diff_t mm = 0,
                                              diff_t ss = 0) noexcept
            : civil_time(impl::n_sec(y, m, d, hh, mm, ss)) {}

    ABEL_CONSTEXPR_MEMBER civil_time() noexcept: f_{1970, 1, 1, 0, 0, 0} {}

    civil_time(const civil_time &) = default;

    civil_time &operator=(const civil_time &) = default;

    // Conversion between civil times of different alignment. Conversion to
    // a more precise alignment is allowed implicitly (e.g., day -> hour),
    // but conversion where information is discarded must be explicit
    // (e.g., second -> minute).
    template<typename U, typename S>
    using preserves_data =
    typename std::enable_if<std::is_base_of<U, S>::value>::type;

    template<typename U>
    ABEL_CONSTEXPR_MEMBER civil_time(const civil_time<U> &ct,
                                     preserves_data<T, U> * = nullptr) noexcept
            : civil_time(ct.f_) {}

    template<typename U>
    explicit ABEL_CONSTEXPR_MEMBER civil_time(const civil_time<U> &ct,
                                              preserves_data<U, T> * = nullptr) noexcept
            : civil_time(ct.f_) {}

    // Factories for the maximum/minimum representable civil_time.
    static ABEL_CONSTEXPR_FUNCTION civil_time(max)() {
        const auto max_year = (std::numeric_limits<std::int_least64_t>::max)();
        return civil_time(max_year, 12, 31, 23, 59, 59);
    }

    static ABEL_CONSTEXPR_FUNCTION civil_time(min)() {
        const auto min_year = (std::numeric_limits<std::int_least64_t>::min)();
        return civil_time(min_year, 1, 1, 0, 0, 0);
    }

    // Field accessors.  Note: All but year() return an int.
    ABEL_CONSTEXPR_MEMBER year_t year() const noexcept { return f_.y; }

    ABEL_CONSTEXPR_MEMBER int month() const noexcept { return f_.m; }

    ABEL_CONSTEXPR_MEMBER int day() const noexcept { return f_.d; }

    ABEL_CONSTEXPR_MEMBER int hour() const noexcept { return f_.hh; }

    ABEL_CONSTEXPR_MEMBER int minute() const noexcept { return f_.mm; }

    ABEL_CONSTEXPR_MEMBER int second() const noexcept { return f_.ss; }

    // Assigning arithmetic.
    ABEL_CONSTEXPR_MEMBER civil_time &operator+=(diff_t n) noexcept {
        f_ = step(T{}, f_, n);
        return *this;
    }

    ABEL_CONSTEXPR_MEMBER civil_time &operator-=(diff_t n) noexcept {
        if (n != (std::numeric_limits<diff_t>::min)()) {
            f_ = step(T{}, f_, -n);
        } else {
            f_ = step(T{}, step(T{}, f_, -(n + 1)), 1);
        }
        return *this;
    }

    ABEL_CONSTEXPR_MEMBER civil_time &operator++() noexcept { return *this += 1; }

    ABEL_CONSTEXPR_MEMBER civil_time operator++(int) noexcept {
        const civil_time a = *this;
        ++*this;
        return a;
    }

    ABEL_CONSTEXPR_MEMBER civil_time &operator--() noexcept { return *this -= 1; }

    ABEL_CONSTEXPR_MEMBER civil_time operator--(int) noexcept {
        const civil_time a = *this;
        --*this;
        return a;
    }

    // Binary arithmetic operators.
    friend ABEL_CONSTEXPR_FUNCTION civil_time operator+(civil_time a, diff_t n) noexcept {
        return a += n;
    }

    friend ABEL_CONSTEXPR_FUNCTION civil_time operator+(diff_t n, civil_time a) noexcept {
        return a += n;
    }

    friend ABEL_CONSTEXPR_FUNCTION civil_time operator-(civil_time a, diff_t n) noexcept {
        return a -= n;
    }

    friend ABEL_CONSTEXPR_FUNCTION diff_t operator-(civil_time lhs, civil_time rhs) noexcept {
        return difference(T{}, lhs.f_, rhs.f_);
    }

    template<typename H>
    friend H abel_hash_value(H h, civil_time a) {
        return impl::AbelHashValueImpl(T{}, std::move(h), a.f_);
    }

private:
    // All instantiations of this template are allowed to call the following
    // private constructor and access the private fields member.
    template<typename U>
    friend
    class civil_time;

    // The designated constructor that all others eventually call.
    explicit ABEL_CONSTEXPR_MEMBER civil_time(fields f) noexcept: f_(align(T{}, f)) {}

    fields f_;
};

// Disallows difference between differently aligned types.
// auto n = civil_day(...) - civil_hour(...);  // would be confusing.
template<typename T, typename U>
ABEL_CONSTEXPR_FUNCTION diff_t operator-(civil_time<T>, civil_time<U>) = delete;

using civil_year = civil_time<year_tag>;
using civil_month = civil_time<month_tag>;
using civil_day = civil_time<day_tag>;
using civil_hour = civil_time<hour_tag>;
using civil_minute = civil_time<minute_tag>;
using civil_second = civil_time<second_tag>;


// Relational operators that work with differently aligned objects.
// Always compares all six fields.
template<typename T1, typename T2>
ABEL_CONSTEXPR_FUNCTION bool operator<(const civil_time<T1> &lhs,
                                       const civil_time<T2> &rhs) noexcept {
    return (
            lhs.year() < rhs.year() ||
            (lhs.year() == rhs.year() &&
             (lhs.month() < rhs.month() ||
              (lhs.month() == rhs.month() &&
               (lhs.day() < rhs.day() || (lhs.day() == rhs.day() &&
                                          (lhs.hour() < rhs.hour() ||
                                           (lhs.hour() == rhs.hour() &&
                                            (lhs.minute() < rhs.minute() ||
                                             (lhs.minute() == rhs.minute() &&
                                              (lhs.second() < rhs.second())))))))))));
}

template<typename T1, typename T2>
ABEL_CONSTEXPR_FUNCTION bool operator<=(const civil_time<T1> &lhs,
                                        const civil_time<T2> &rhs) noexcept {
    return !(rhs < lhs);
}

template<typename T1, typename T2>
ABEL_CONSTEXPR_FUNCTION bool operator>=(const civil_time<T1> &lhs,
                                        const civil_time<T2> &rhs) noexcept {
    return !(lhs < rhs);
}

template<typename T1, typename T2>
ABEL_CONSTEXPR_FUNCTION bool operator>(const civil_time<T1> &lhs,
                                       const civil_time<T2> &rhs) noexcept {
    return rhs < lhs;
}

template<typename T1, typename T2>
ABEL_CONSTEXPR_FUNCTION bool operator==(const civil_time<T1> &lhs,
                                        const civil_time<T2> &rhs) noexcept {
    return lhs.year() == rhs.year() && lhs.month() == rhs.month() &&
           lhs.day() == rhs.day() && lhs.hour() == rhs.hour() &&
           lhs.minute() == rhs.minute() && lhs.second() == rhs.second();
}

template<typename T1, typename T2>
ABEL_CONSTEXPR_FUNCTION bool operator!=(const civil_time<T1> &lhs,
                                        const civil_time<T2> &rhs) noexcept {
    return !(lhs == rhs);
}

enum class weekday {
    monday,
    tuesday,
    wednesday,
    thursday,
    friday,
    saturday,
    sunday,
};

ABEL_CONSTEXPR_FUNCTION weekday get_weekday(const civil_second &cs) noexcept {
    ABEL_CONSTEXPR_VARIABLE
    weekday k_weekday_by_mon_off[13] = {
            weekday::monday, weekday::tuesday, weekday::wednesday,
            weekday::thursday, weekday::friday, weekday::saturday,
            weekday::sunday, weekday::monday, weekday::tuesday,
            weekday::wednesday, weekday::thursday, weekday::friday,
            weekday::saturday,
    };
    ABEL_CONSTEXPR_VARIABLE int k_weekday_offsets[1 + 12] = {
            -1, 0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4,
    };
    year_t wd = 2400 + (cs.year() % 400) - (cs.month() < 3);
    wd += wd / 4 - wd / 100 + wd / 400;
    wd += k_weekday_offsets[cs.month()] + cs.day();
    return k_weekday_by_mon_off[wd % 7 + 6];
}

ABEL_CONSTEXPR_FUNCTION civil_day next_weekday(civil_day cd, weekday wd) noexcept {
    ABEL_CONSTEXPR_VARIABLE
    weekday k_weekdays_forw[14] = {
            weekday::monday, weekday::tuesday, weekday::wednesday,
            weekday::thursday, weekday::friday, weekday::saturday,
            weekday::sunday, weekday::monday, weekday::tuesday,
            weekday::wednesday, weekday::thursday, weekday::friday,
            weekday::saturday, weekday::sunday,
    };
    weekday base = get_weekday(cd);
    for (int i = 0;; ++i) {
        if (base == k_weekdays_forw[i]) {
            for (int j = i + 1;; ++j) {
                if (wd == k_weekdays_forw[j]) {
                    return cd + (j - i);
                }
            }
        }
    }
}

ABEL_CONSTEXPR_FUNCTION civil_day prev_weekday(civil_day cd, weekday wd) noexcept {
    ABEL_CONSTEXPR_VARIABLE
    weekday k_weekdays_back[14] = {
            weekday::sunday, weekday::saturday, weekday::friday,
            weekday::thursday, weekday::wednesday, weekday::tuesday,
            weekday::monday, weekday::sunday, weekday::saturday,
            weekday::friday, weekday::thursday, weekday::wednesday,
            weekday::tuesday, weekday::monday,
    };
    weekday base = get_weekday(cd);
    for (int i = 0;; ++i) {
        if (base == k_weekdays_back[i]) {
            for (int j = i + 1;; ++j) {
                if (wd == k_weekdays_back[j]) {
                    return cd - (j - i);
                }
            }
        }
    }
}

ABEL_CONSTEXPR_FUNCTION int get_yearday(const civil_second &cs) noexcept {
    ABEL_CONSTEXPR_VARIABLE int k_month_offsets[1 + 12] = {
            -1, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334,
    };
    const int feb29 = (cs.month() > 2 && impl::is_leap_year(cs.year()));
    return k_month_offsets[cs.month()] + feb29 + cs.day();
}


std::ostream &operator<<(std::ostream &os, const civil_year &y);

std::ostream &operator<<(std::ostream &os, const civil_month &m);

std::ostream &operator<<(std::ostream &os, const civil_day &d);

std::ostream &operator<<(std::ostream &os, const civil_hour &h);

std::ostream &operator<<(std::ostream &os, const civil_minute &m);

std::ostream &operator<<(std::ostream &os, const civil_second &s);

std::ostream &operator<<(std::ostream &os, weekday wd);

}  // namespace detail

}  // namespace chrono_internal
}  // namespace abel
#endif  // ABEL_CHRONO_INTERNAL_CHRONO_TIME_DETAIL_H_
